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Ransom:Win32/Tescrypt

First posted on 28 April 2015.
Source: Microsoft

Aliases :

There are no other names known for Ransom:Win32/Tescrypt.

Explanation :

Threat behavior

Installation
This threat can create files on your PC, including:

• %APPDATA%\key.dat
• %APPDATA%\wcpfgmt.exe

It modifies the registry so that it runs each time you start your PC. For example:

In subkey: HKLM\software\microsoft\windows\currentversion\run
Sets value: "msconfig"
With data: "%APPDATA%\wcpfgmt.exe"


The malware uses code injection to make it harder to detect and remove. It can inject code into running processes.

As of April 2015, we have observed an increase in Tescrypt activity as it gets dropped by a few exploit kits such as Angler, Nuclear, Fiesta, and Sweet Orange.



Payload


Additional information

Creates a mutex

This threat can create one or more mutexes on your PC. For example:

• AMResourceMutex2
• dslhufdks3
• VideoRenderer

It might use this mutex as an infection marker to prevent more than one copy of the threat running on your PC.



This malware description was published using automated analysis of file SHA1 8dcdd62fc906e744acb0e41a39d75e2143cf62f9.

Symptoms

The following can indicate that you have this threat on your PC:

• You see a file similar to:
  • %APPDATA%\key.dat
  • %APPDATA%\wcpfgmt.exe

• You see registry modifications such as:
  
  • In subkey: HKLM\software\microsoft\windows\currentversion\run
    Sets value: "msconfig"
    With data: "%APPDATA%\wcpfgmt.exe"
    
    

• You see the following mutex:
  • AMResourceMutex2
  • dslhufdks3
  • VideoRenderer

Last update 28 April 2015

 

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